JP2022063905A - Sensor - Google Patents

Abstract

To provide a sensor which enables a detection target electric wire to be easily inserted into a notch while the wire is close to adjacent arrangement objects without incurring a decrease in physical strength, detection sensitivity and shield performance of the sensor.SOLUTION: A sensor has an electric wire insertion portion, and a region on the tip 4a side of the electric wire insertion portion is formed in such a way that a maximum width Wa along the insertion direction of the detection target electric wire to a notch 21a in a first range (range of arrow Ca) from the tip 4a to a rim on tip 4a side of the notch 21a is smaller than a maximum height along a direction orthogonal to both the cylinder length direction and the insertion direction, and the width along the insertion direction in a second range (range of arrow Cb) from the rim on tip 4a side of the notch 21a to a rim on rear end side becomes gradually large, and that both the maximum width Wb and minimum height in a third range (range of arrow Cc) rearward of the rim on rear end side of the notch 21a are larger than the width Wa.SELECTED DRAWING: Figure 6

Description

The present invention relates to a sensor capable of detecting the detected amount of the electric wire to be detected in a non-contact state with respect to the conductor of the electric wire to be detected.

As a sensor of this type, the applicant has described the voltage detection probe (hereinafter, also simply referred to as “detection probe”) capable of detecting the voltage of the measurement target electric wire (detection target electric wire) in a state of non-contact with the core wire. It is disclosed in the patent document of.

The detection probe includes a grip portion gripped by the user and a detection electrode unit connected to the main body unit via a shielded cable. In addition, the detection electrode unit has a first shielded cylinder in which an insertion recess (notch) into which an electric wire to be measured can be inserted is formed, and the surface is covered with an insulating coating and is slidable with respect to the first shielded cylinder. The inserted detection electrode, the second shield cylinder fixed to the inside of the grip portion and the first shield cylinder inserted and fixed, and the first shield cylinder and the second shield cylinder connected to the detection electrode. It is provided with an operation lever for sliding the detection electrode with respect to the shield cylinder and the grip portion, and an urging member for urging the detection electrode toward the tip portion side.

When detecting the voltage of the core wire in the wire to be measured by using this detection probe, the detection probe is attached to the wire to be measured. Specifically, first, the operation lever is pulled toward the front side while the grip portion is gripped, and the detection electrode is slid toward the front side inside the first shield cylinder. As a result, the electric wire to be measured can be inserted into the insertion recess. Next, after inserting the wire to be measured into the insertion recess while pressing the operation lever, release the hand from the operation lever. At this time, as a result of the detection electrode being slid toward the tip end side of the first shield cylinder by the urging force of the urging member, the tip surface of the detection electrode and the tip side notch surface (inside) of the first shield cylinder body. The wire to be measured is sandwiched between the end face and the wire. As a result, the mounting work of the detection probe on the measurement target wire is completed, and the core wire of the measurement target wire and the detection electrode of the detection probe are capacitively coupled to detect the voltage of the measurement target wire (core wire). It will be possible.

Japanese Unexamined Patent Publication No. 2017-909576 (pages 7-20, 1-19)

However, the detection probe disclosed by the applicant in the above patent document has the following problems to be improved. Specifically, in the detection probe disclosed by the applicant, the tip surface of the detection electrode is pressed against the wire to be measured inserted in the insertion recess (notch) of the first shielded cylinder (wire insertion portion). A configuration is adopted in which the core wire of the wire to be measured and the detection electrode are capacitively coupled to detect the voltage of the wire to be measured (core wire).

On the other hand, this type of detection probe (sensor) detects the detected amount such as voltage by using one of a plurality of electric wires arranged close to each other as a measurement target electric wire, or arranges it in the vicinity of a substrate or a casing. It is also used when detecting the amount to be detected by using the wire that has been measured as the wire to be measured. In this case, the detection probe disclosed by the applicant is configured to insert a detection electrode formed in a small-diameter columnar shape into a first shield cylinder formed in a small-diameter cylindrical shape, whereby the detection probe is provided. The tip side part (the part where the insertion recess is formed) has a small diameter rod shape. As a result, even when the detected amount is detected using an electric wire having a nearby arrangement such as another electric wire, a substrate, and a casing as a measurement target electric wire, a detection probe (a detection probe) is used in the gap between the proximity arrangement and the measurement target electric wire. It is possible to insert the wire to be measured into the insertion recess by inserting the tip end side portion of the first shield cylinder).

However, in today's world where electronic devices are becoming smaller and the number of wires used is increasing, the gap between the adjacent object and the wire to be measured is narrower than the diameter of the tip side portion of the detection probe disclosed by the applicant. There may be. In such a case, for example, by pushing one or both of the measurement target electric wire and the proximity arrangement with one hand to avoid it, the gap between the measurement target electric wire and the proximity arrangement is widened, and in that state. It is necessary to insert the wire to be measured into the insertion recess by inserting the tip of the detection probe (first shield cylinder) held in the other hand into the gap. Therefore, when the gap between the close object and the wire to be measured is narrow, the work of attaching the detection probe to the wire to be measured is complicated.

In this case, the applicant modifies the configuration of the disclosed detection probe to make the first shielded cylinder even smaller in diameter, so that the detection probe (even when the gap between the proximity arrangement and the wire to be measured is narrow). The tip of the first shield cylinder) can be easily inserted. However, in order to reduce the diameter of the first shield cylinder, it is necessary to reduce the diameter of the detection electrode inserted into the first shield cylinder. Therefore, in the detection electrode, the electrode surface facing the core wire of the conductor to be measured becomes narrow, and the detection sensitivity of the measured quantity is lowered.

Further, when the outer diameter of the first shield cylinder is reduced without reducing the diameter of the detection electrode, the first shield cylinder becomes thin and it becomes difficult to secure sufficient physical strength. It may be easily affected by disturbance (noise is mixed into the detection electrode inside the first shield cylinder). Furthermore, by reducing the diameter of only the tip side of the insertion recess in the first shield cylinder, the diameter of the detection electrode is not reduced or the thickness of the first shield cylinder is not reduced, and the object to be measured is close to the object. It is possible to easily insert the tip of the detection probe (first shield cylinder) into the gap between the wire and the wire. However, since the portion of the first shielded cylinder that shields the electrode surface of the detection electrode (the portion facing the electrode surface of the first shielded cylinder) becomes smaller, the influence of disturbance (noise mixed in the detection electrode) becomes smaller. ) Will be more likely to be received.

The present invention has been made in view of the problem to be improved, and the electric wire to be detected in a state where the gap between the electric wire and the adjacent object is small without causing deterioration of physical strength, detection sensitivity and shielding performance. The main purpose is to provide a sensor that can be easily inserted into the notch.

In order to achieve the above object, the sensor according to claim 1 is made of an electrode, an electrode holding portion formed in a tubular shape so that the electrode can be inserted, and a tubular material having conductivity so that the electrode holding portion can be inserted. It is provided with an electric wire insertion part which is formed in the above and is configured so that the electric wire to be detected can be inserted into the notch in which a part of the peripheral wall at the tip end side portion is cut out, and the cylinder of the electrode holding part and the electric wire insertion part. The electric wire insertion portion is configured to be relatively movable with respect to the electrode holding portion along the longitudinal direction, and is held by the electrode holding portion with respect to the detection target electric wire inserted into the electric wire insertion portion. By bringing the electrodes relatively close to each other, the detected amount of the detection target electric wire can be detected in a non-contact state with respect to the lead wire in the insulation coating of the detection target electric wire. In the sensor, the electric wire insertion portion is the detection target electric wire for the notch within the first range along the tubular length direction from the tip portion to the mouth edge portion on the tip end side of the notch. The maximum width along the insertion direction is smaller than the maximum height along the direction orthogonal to both the tube length direction and the insertion direction, and the cut is made from the rim portion on the tip side of the notch. A portion is provided in the second range along the cylinder length direction up to the rim on the rear end side of the wire insertion portion in the notch, and a portion where the width along the insertion direction gradually increases is provided, and the cut is provided. The minimum width along the insertion direction within the third range on the rear end side of the notch on the rear end side, and the direction orthogonal to both the tube length direction and the insertion direction. The tip side portion is formed so that both the minimum height along the line and the maximum width in the first range are larger than the maximum width.

The sensor according to claim 2 is the sensor according to claim 1. In the sensor according to claim 1, the wire insertion portion is smaller so that the width along the insertion direction in the first range is from the portion having the maximum width toward the tip portion. The tip side portion is formed so as to be.

The sensor according to claim 3 is the sensor according to claim 2, wherein the electric wire insertion portion has a length along the cylinder length direction from the tip portion to the maximum width portion in the first range. The tip side portion is formed so as to be larger than 1/2 of the maximum width in the first range.

The sensor according to claim 4 is the sensor according to any one of claims 1 to 3, wherein the electric wire insertion portion is along a direction orthogonal to both the cylinder length direction and the insertion direction in the first range. The tip portion side portion is formed so that the height becomes smaller toward the tip portion from the portion having the maximum height.

The sensor according to claim 5 is the sensor according to any one of claims 1 to 4, wherein the electric wire insertion portion has the maximum width in the first range close to the electric wire to be detected at the electrode. The tip end side portion is formed so as to have a width equal to or larger than the width along the insertion direction on the electrode surface.

In the sensor according to claim 1, the maximum width along the insertion direction of the wire to be detected with respect to the notch within the first range along the cylinder length direction from the tip to the rim on the tip side of the notch. Is smaller than the maximum height along the direction orthogonal to both the tube length direction and the insertion direction, and from the rim on the tip side in the notch to the rim on the rear end side of the wire insertion part in the notch. Within the second range along the tube length direction to the portion, a portion where the width along the insertion direction gradually increases is provided, and at the same time, the rear end side of the notch on the rear end side side of the mouth edge is provided. Both the minimum width along the insertion direction within the third range and the minimum height along the direction orthogonal to both the tube length direction and the insertion direction are greater than the maximum width in the first range. The tip side portion of the electric wire insertion portion is formed as described above.

Therefore, according to the sensor according to claim 1, even when the sensor is mounted on the detection target electric wire in a state where the gap between the proximity arrangement and the detection target electric wire is extremely small, the distance between the detection target electric wire and the proximity arrangement object is separated. By inserting the wire insertion portion into the gap so that the direction is aligned with the width direction of the tip portion side portion, the wire can be smoothly (that is, easily) inserted without applying a large stress to the wire to be detected. Also, when inserting the wire insertion part between the wire to be detected and the adjacent object until the wire to be detected is located on the side of the notch, the width along the insertion direction gradually increases within the second range. Since the portion to be enlarged is provided, the tip side portion can be inserted so as to gradually separate the detection target electric wire from the adjacent object, and as a result, the detection target electric wire is not subjected to a large stress and is smooth (that is,). Can be easily inserted into). Further, since the width and height of the electric wire insertion portion in the third range are sufficiently large, the physical strength of the electric wire insertion portion is sufficiently high, and it is possible to suitably prevent noise from being mixed into the electrodes in the electric wire insertion portion. (That is, without deteriorating the shielding performance), and by arranging an electrode having a sufficient thickness in the wire insertion portion together with the electrode holding portion, the detection sensitivity of the detected amount can be sufficiently increased.

According to the sensor according to claim 2, the tip side portion of the electric wire insertion portion is formed so that the width along the insertion direction becomes smaller from the portion having the maximum width toward the tip portion in the first range. , Even when the gap between the proximity placement and the detection target wire is smaller than the maximum width in the first range above, the tip can be easily inserted into the gap between the proximity placement and the detection target wire. Can be plugged into.

According to the sensor according to claim 3, the length along the cylinder length direction from the tip portion to the portion having the maximum width in the first range is larger than 1/2 of the maximum width in the first range. By forming the tip end side portion of the electric wire insertion portion as described above, the tip end portion can be more easily inserted into the gap between the adjacent object and the electric wire to be detected.

According to the sensor of claim 4, the electric wire so that the height along the direction orthogonal to both the cylinder length direction and the insertion direction in the first range becomes smaller from the portion having the maximum height toward the tip portion. By forming the tip end side portion of the insertion portion, the tip portion can be more easily inserted into the gap between the adjacent object and the wire to be detected.

According to the sensor according to claim 5, the tip end side portion of the electric wire insertion portion so that the maximum width in the first range is equal to or larger than the width along the insertion direction on the electrode surface close to the electric wire to be detected in the electrode. By forming the above, it is possible to suitably prevent the mixing of noise from the extending direction of the electrode (the direction orthogonal to the electrode surface) by the portion on the tip end side of the wire insertion portion.

It is an external perspective view of a voltage sensor 1. It is another external perspective view of the voltage sensor 1. FIG. FIG. 3 is an enlarged perspective view of a tip portion of the voltage sensor 1. It is another enlarged perspective view of the tip portion in the voltage sensor 1. It is explanatory drawing for demonstrating the shape of the insertion part main body 21 in the electric wire insertion part 4, and the size of each part. It is another explanatory drawing for demonstrating the shape of the insertion part main body 21 in the electric wire insertion part 4, and the size of each part. It is an enlarged side view of the tip part in the voltage sensor 1 in the non-use state. It is explanatory drawing for demonstrating the work of holding the coated electric wire Xa arranged close to the coated electric wire Xb by the voltage sensor 1 (the voltage sensor 1 is attached to the coated electric wire Xa). It is another explanatory diagram for demonstrating the work of holding the coated electric wire Xa by the voltage sensor 1 (attaching the voltage sensor 1 to the coated electric wire Xa). It is explanatory drawing for demonstrating the state which held the coated electric wire Xa by the voltage sensor 1 (the voltage sensor 1 was attached to the coated electric wire Xa). It is a front view of the insertion part main body 21 alone in the electric wire insertion part 4 of a voltage sensor 1. It is a rear view of the insertion part main body 21 alone. It is a left side view of the insertion part main body 21 alone. It is a right side view of the insertion part main body 21 alone. It is a top view of the insertion part main body 21 alone. It is a bottom view of the insertion part main body 21 alone. It is an external perspective view of the insertion part main body 21 alone. It is another external perspective view of the insertion part main body 21 alone. It is still another external perspective view of the insertion part main body 21 alone. 13 is a cross-sectional view taken along the line AA of the insertion portion main body 21 cut along the line AA in FIGS. 13 and 14.

Hereinafter, embodiments of the sensor will be described with reference to the accompanying drawings.

The voltage sensor 1 shown in FIGS. 1 and 2 is an example of a “sensor”, and is an example of a coated electric wire Xa in which a conducting wire (core wire) is covered with an insulating coating (an example of a “detection target electric wire”: FIGS. 8 to 8 to FIG. The voltage supplied to the conducting wire (see 10) (an example of the "detected amount of the wire to be detected") can be detected in a non-contact state with respect to the conducting wire. The voltage sensor 1 includes an electrode 2, an electrode holding portion 3, an electric wire insertion portion 4, and a signal cable 5, and is configured to be mountable to a covered electric wire Xa to be detected (so that the coated electric wire Xa can be inserted). , It is configured to be connectable to a measuring device (not shown) by a signal cable 5.

The electrode 2 is an example of an “electrode”, and as shown in FIG. 3, it is formed of a conductive metal material into a columnar shape (cylindrical column in this example), and is inserted into an electric wire insertion portion 4 as described later. In a state where the tip portion 2a (tip surface) is pressed against the coated wire Xa (“a state in which the wire is brought close to the conductor in the insulating coating of the wire to be detected), the coated wire is passed through the insulating coating of the coated wire Xa. This electrode 2 is capacitively coupled to the lead wire of Xa. This electrode 2 is inserted through the holding portion main body 11 so that the tip portion 2a (tip surface) is exposed from the holding portion main body 11 described later in the electrode holding portion 3. Along with being integrated with 11 (an example of a configuration in which the cable is held by the electrode holding portion while being inserted into the electrode holding portion), the signal cable 5 is connected to the rear end portion in the holding portion main body 11. There is. In this case, in the signal cable 5 to which the electrode 2 is connected, the conductor wire (core wire) is shielded by the shielded wire (net wire), and noise is prevented from being mixed into the conductor wire.

The electrode holding portion 3 is an example of the “electrode holding portion” and is formed in a tubular shape (in this example, a cylindrical shape) as a whole. The electrode holding portion 3 includes a holding portion main body 11 and an insulator 12, and is configured to be able to hold the electrode 2 so that the tip portion 2a (tip surface) of the electrode 2 is exposed from the tip portion of the holding portion main body 11. At the same time, as shown in FIGS. 1 and 2, a grip portion 11a (a grip portion for the user to grip the voltage sensor 1 when the voltage sensor 1 is used) is arranged on the rear end side of the holding portion main body 11. There is.

In this case, the holding portion main body 11 is, for example, formed of a conductive metal material. Further, the grip portion 11a is formed in a tubular shape (cylindrical shape) with an insulating material (for example, an insulating resin) so that the signal cable 5 can be inserted therethrough. Further, the insulator 12 is formed in a cylindrical shape (cylindrical shape) so that the electrode 2 can be held with respect to the holding portion main body 11 while insulating the electrode 2 and the holding portion main body 11 from each other.

The electric wire insertion portion 4 is an example of the “electric wire insertion portion”, and as shown in FIGS. 1 and 2, the electric wire insertion portion 4 is arranged on the insertion portion main body 21 disposed on the front end portion 4a side and the rear end portion 4b side. The operation knob 22 is provided. In this case, in the voltage sensor 1 of this example, as an example, the wire insertion portion 4 (operation knob) is provided with respect to the electrode holding portion 3 (grip portion 11a) along the cylinder length direction of the electrode holding portion 3 and the wire insertion portion 4. 22) is configured to be slidable (an example of a configuration in which the wire insertion portion can be moved relative to the electrode holding portion along the cylinder length direction).

As shown in FIGS. 3 to 20, the insertion portion main body 21 has a cylindrical shape (as an example) through which the electrode holding portion 3 in a state where the electrode 2 is held by stainless steel (an example of “material having conductivity”) can be inserted. In this example, it is formed in a cylindrical shape). The insertion portion main body 21 is a member constituting a "peripheral wall" in a portion on the side of the tip portion 4a (an example of the "tip portion side portion"), and a part thereof is cut out to form a notch 21a ("cut"). An example of a “notch”) is provided so that a coated electric wire Xa or the like can be inserted into the notch 21a.

Further, as shown in FIGS. 5 and 6, the insertion portion main body 21 has a mouth edge portion (both) on the tip portion 4a side of the notch 21a from the tip portion 4a of the wire insertion portion 4 (the position of the broken line B1 in both figures). Within the "first range (range of arrow Ca)" along the "cylinder length direction (horizontal direction in both figures)" up to the position of the broken line B2 in the figure, the "insertion direction" of the coated electric wire Xa with respect to the notch 21a. (Vertical direction in FIG. 6) ”is the direction in which the“ maximum width (width Wa in FIG. 6 in this example) ”is orthogonal to both the“ cylinder length direction ”and the“ insertion direction ”(vertical direction in FIG. 5). : Hereinafter, this direction is also referred to as the "first direction"), and the portion on the tip portion 4a side is formed so as to be smaller than the "maximum height (height Ha in FIG. 5 in this example)". Has been done.

Further, the insertion portion main body 21 has a mouth edge portion (both) on the rear end portion 4b side of the wire insertion portion 4 in the notch 21a from the mouth edge portion (position of the broken line B2) on the tip portion 4a side in the notch 21a. Within the "second range (range of arrow Cb)" along the "cylinder length direction" up to the position of the broken line B3 in the figure, the width of the insertion portion main body 21 along the above "insertion direction" is the rear end. A portion that becomes larger toward the portion 4b side is provided.

In this case, in the insertion portion main body 21 of this example, the rear end portion slightly from the mouth edge portion (position of the broken line B2) on the tip portion 4a side of the notch 21a in the “second range (range of arrow Cb)”. The width of the insertion portion main body 21 along the "insertion direction" from the position closer to 4b (the position of the broken line B2a in both figures) is formed so as to gradually increase toward the rear end portion 4b. Further, the portion of the insertion portion main body 21 on the rear end portion 4b side of the notch 21a is formed in a cylindrical shape, and as shown in FIGS. 3 to 5, the edge of the notch 21a on the rear end portion 4b side in side view. In the insertion portion main body 21 of this example in which the portion is inclined so as to be located closer to the rear end portion 4b toward the open end (upper end in FIG. 5) side of the notch 21a, as shown in FIG. At the position closer to the tip portion 4a (the position of the broken line B3a in both figures) than the mouth edge portion (the position of the broken line B3) on the rear end portion 4b side of the notch 21a in "the range of the arrow Cb". The width of the insertion portion main body 21 along the "insertion direction" is equal to the width Wb of the insertion portion main body 21 at the mouth edge portion (position of the broken line B3) on the rear end portion 4b side of the notch 21a. That is, in the electric wire insertion portion 4 (insertion portion main body 21) of this example, the range along the "cylinder length direction" from the position of the broken line B2a to the position of the broken line B3a is "the width along the insertion direction gradually increases. Corresponds to "the part that grows".

Further, the insertion portion main body 21 is within the "third range (range of arrow Cc)" on the rear end portion 4b side of the notch 21a on the rear end portion 4b side of the mouth edge portion (position of arrow B3). In, the "minimum width (width Wb shown in FIG. 6 in this example)" along the "insertion direction" and the "minimum height (in this example, FIG. 5)" along the "first direction". A portion on the tip portion 4a side is formed so that both of the indicated height Hb) ”is larger than the above-mentioned“ maximum width (width Wa shown in FIG. 6) ”in the“ first range ”. Further, the insertion portion main body 21 has an "electrode surface (tip portion 2a)" in which the above-mentioned "maximum width (width Wa shown in FIG. 6)" in the "first range" is brought close to the coated electric wire Xa or the like at the electrode 2. The portion on the tip portion 4a side is formed so as to have a width (the diameter R2 shown in FIG. 6 in this example in which the electrode 2 is columnar) or more along the "insertion direction" in the "side end surface)". In this case, in the voltage sensor 1 of this example, the center of the portion on the tip portion 4a side of the wire insertion portion 4 in the "insertion direction" and the electrode inserted into the wire insertion portion 4 while being held by the electrode holding portion 3. It is configured so that the center in the "insertion direction" of 2 coincides with the tube length direction of the electrode holding portion 3 and the electric wire inserting portion 4.

Further, the insertion portion main body 21 becomes smaller toward the tip portion 4a from the portion having the maximum width Wa along the "insertion direction" in the above "first range", and is viewed in a plan view (or bottom view). The portion on the tip portion 4a side is formed so that the tip portion 4a is located at the center in the width direction. Further, the insertion portion main body 21 is composed of tapered surfaces whose both side surfaces intersect with the "cylinder length direction" in a plan view (or bottom view) of the portion on the tip portion 4a side. In this case, in the insertion portion main body 21 of this example, it is along the "cylinder length direction" from the tip portion 4a to the portion of the above "maximum width (width Wa shown in FIG. 6)" in the "first range". The length (length L1 shown in FIG. 6) is larger than 1/2 (length L2 shown in FIG. 6) of the "maximum width" in the "first range".

Further, both side surfaces of the portion on the tip portion 4a side are formed of linear tapered surfaces in a plan view (or bottom view), and the tip portion 4a is located at the center in the width direction in a plan view (or bottom view). In the insertion portion main body 21 of this example formed in, the tip portion 4a is in a state of being sharply pointed in a plan view (or bottom view). Further, in the insertion portion main body 21 of this example, the tip portion 4a is rounded as shown in FIGS. It is formed to have a shape.

Further, as shown in FIG. 5, the height of the insertion portion main body 21 along the above-mentioned "first direction" in the "first range" is toward the tip portion 4a from the portion having the maximum height Ha. A portion on the tip 4a side is formed so as to be smaller. In this case, in the insertion portion main body 21 of this example, the tip side of the portion on the tip portion 4a side in the side view is formed so as to have a semicircular shape.

Further, the operation knob 22 is a portion operated by the user when the electric wire insertion portion 4 is moved (sliding) with respect to the electrode holding portion 3 (grip portion 11a), and as an example, an insulating resin material is used. The electrode holding portion is formed into a tubular shape (cylindrical shape in this example) through which the electrode holding portion can be inserted, and is integrated with the insertion portion main body 21.

Further, in this voltage sensor 1, as an example, a coil spring (not shown) is housed in the wire insertion portion 4 together with the electrode holding portion 3, and as shown in FIG. 7, the elastic restoring force (extension) of the coil spring is accommodated. The wire insertion portion 4 is urged with respect to the electrode holding portion 3 (electrode 2) in the direction of the arrow D1 (direction from the front end portion to the rear end portion of the voltage sensor 1) by the urging force in the direction. As a result, in the voltage sensor 1 of this example, the tip portion 2a of the electrode 2 is positioned on the tip portion 4a side of the notch 21a in the wire insertion portion 4 (insertion portion main body 21) in the non-use state, and the electrode 2 is positioned. The holding electrode holding portion 3 is in a state of being visually recognized from the notch 21a.

Further, when the voltage sensor 1 is attached to the coated electric wire Xa or removed from the coated electric wire Xa, the electric wire insertion portion is provided with respect to the electrode holding portion 3 along the cylinder length direction of the electrode holding portion 3 and the electric wire inserting portion 4. By moving (sliding) 4 in the direction of the arrow D2, the covered electric wire Xa or the like is inserted into the notch 21a of the electric wire insertion portion 4, and the covered electric wire Xa or the like inserted into the notch 21a is separated from the notch 21a. Is configured to be possible.

Next, a voltage detection method using the voltage sensor 1 will be described with reference to the accompanying drawings.

As described above, this type of "sensor" targets one of a plurality of electric wires arranged close to each other, or an electric wire arranged in the vicinity of a substrate, casing, or the like as a detection target. May be used. As an example, as in the covered electric wire Xa shown by the solid wire in FIG. 8, the “detected amount” of the “detected electric wire” in a state where the gap between the adjacent solid wire coated electric wire Xb (proximate arrangement) is very narrow. An example of detecting "" will be described.

In this case, as shown in FIG. 7, in the voltage sensor 1 of this example, the wire insertion portion 4 is oriented in the direction of the arrow D1 with respect to the electrode holding portion 3 by a coil spring (not shown) arranged in the wire insertion portion 4. The electrode holding portion 3 holding the electrode 2 is urged and is visible from the notch 21a, that is, the coated electric wire Xa or the like cannot be inserted into the notch 21a. Therefore, when mounting the voltage sensor 1 on the coated electric wire Xa (holding the coated electric wire Xa by the voltage sensor 1), first, the electric wire is attached to the electrode holding portion 3 (grip portion 11a) against the urging force of the coil spring. The insertion portion 4 (operation knob 22) is slid in the direction of the arrow D2, and as shown in FIG. 8, the tip portion 2a of the electrode 2 held by the electrode holding portion 3 is cut away from the rear end portion 4b side of the notch 21a. Position it (on the right side in the figure). As a result, the covered electric wire Xa or the like can be inserted into the notch 21a.

Next, while maintaining the state in which the wire insertion portion 4 is slid with respect to the electrode holding portion 3 as described above, the tip portion 4a of the wire insertion portion 4 (insertion portion main body 21) is placed between the coated wires Xa and Xb. Insert it into the gap. Specifically, the direction of the width Wa of the portion on the tip portion 4a side of the electric wire insertion portion 4 is aligned with the separation direction of both coated electric wires Xa and Xb (the direction of the height Ha is the direction of both coated electric wires Xa and Xb). Insert the tip portion 4a into the gap between both covered electric wires Xa and Xb (so as to align with the extending direction).

In this case, in the voltage sensor 1 of this example, as described above, the height of the portion (within the "first range") on the tip portion 4a side of the wire insertion portion 4 (insertion portion main body 21) is the maximum height. The portion on the tip portion 4a side is formed so as to become smaller toward the tip portion 4a from the portion of the Ha. That is, in the voltage sensor 1 of this example, a part (the most advanced portion) in the height direction of the portion of the wire insertion portion 4 on the tip end portion 4a side is in a protruding state. Therefore, for example, the height within the "first range" of the "electric wire insertion portion" is constant, that is, the tip portion of the "electric wire insertion portion" is in the radial direction of the "electric wire insertion portion" in the side view. Unlike the case of adopting a configuration in which the wires are linear along the line, an attempt is made to insert the wires in a state where the height Ha of the wire insertion portion 4 is slightly tilted with respect to the extending direction of both covered wires Xa and Xb. Even in this case, both ends (upper end and lower end) in the height Ha direction at the portion on the tip end portion 4a side of the wire insertion portion 4 are brought into contact with both covered electric wires Xa and Xb at the tip portion 4a (height). Is the smallest) is inserted between both coated wires Xa and Xb. This makes it possible to smoothly insert the electric wire insertion portion 4 between both covered electric wires Xa and Xb.

Further, in the voltage sensor 1 of this example, as described above, the portion of the wire insertion portion 4 (insertion portion main body 21) on the tip portion 4a side (within the "first range") has the maximum width Wa. The electric wire insertion portion 4 is formed so as to become smaller toward the tip portion 4a. Further, in the voltage sensor 1 of this example, the length along the "cylinder length direction" from the tip portion 4a to the portion having the maximum width Wa in the "first range" is the maximum in the "first range". The portion on the tip portion 4a side is formed so as to be larger than 1/2 of the width Wa, and the portion on the tip portion 4a side is in an acute-angled state. Therefore, as shown by the solid line in FIG. 8, even when both coated electric wires Xa and Xb are arranged very close to each other, the operator manually pushes both coated electric wires Xa and Xb to avoid the gap. It is possible to easily insert the tip portion 4a into a very small gap without performing the work of enlarging. Further, in the voltage sensor 1 of this example, since the tip portion 4a has a rounded shape, even if the tip portion 4a is in contact with either of the both coated electric wires Xa and Xb, both coated electric wires Xa and Xb It is possible to suitably avoid a situation in which the wire is damaged.

Further, in the electric wire insertion portion 4 formed so that the width of the portion on the tip portion 4a side becomes smaller toward the tip portion 4a from the portion having the width Wa as described above, the width of the portion on the tip portion 4a side is rearward. It becomes larger toward the end 4b. Therefore, when the voltage sensor 1 is moved in the direction of the arrow D2 with respect to both the coated electric wires Xa and Xb from the state where the tip portion 4a is inserted between the both coated electric wires Xa and Xb shown by the solid wire, the both coated electric wires Xa , Xb are guided in the separation direction so as to be separated from each other by the portion on the tip portion 4a side of the wire insertion portion 4, and both coated electric wires Xa and Xb are the portions on the tip portion 4a side as shown by the one-point chain line in the figure. The voltage sensor 1 (wire insertion portion 4) can be smoothly inserted until the position of the maximum width Wa in the above is reached.

Actually, the voltage sensor 1 is moved with respect to both covered electric wires Xa and Xb, but in the same figure and FIGS. 9 and 10 referred to later, the voltage sensor 1 (wire insertion portion 4) and both coated electric wires In order to facilitate the understanding of the positional relationship with Xa and Xb, the relative positions of both covered electric wires Xa and Xb at each time point during the mounting work are illustrated with respect to the fixedly illustrated voltage sensor 1. ing.

Further, in the voltage sensor 1 of this example, as described above, the maximum width Wa at the portion (within the "first range") on the tip portion 4a side of the wire insertion portion 4 (insertion portion main body 21) is the maximum height. It is smaller than Ha, and the width of the portion on the tip 4a side is sufficiently small. Therefore, the direction of the height Ha of the portion on the tip portion 4a side is aligned with the separation direction of the coated electric wires Xa and Xb (the direction of the width Wa is aligned with the extending direction of the coated electric wires Xa and Xb). Compared to the case where the tip portion 4a is inserted into the gap between the coated wires Xa and Xb, the direction of the width Wa of the portion on the tip portion 4a side is aligned with the separation direction of both the coated wires Xa and Xb as in this example. When inserted (so that the direction of height Ha is aligned with the extending direction of both coated wires Xa and Xb), the distance between both coated wires Xa and Xb in the state where the portion on the tip 4a side is inserted. The distance becomes smaller. As a result, it is possible to preferably avoid a situation in which a large stress is applied to both covered electric wires Xa and Xb when the electric wire insertion portion 4 is inserted.

In this case, although it is different from this example in which the voltage sensor 1 (wire insertion portion 4) is inserted between both covered wires Xa and Xb shown by the solid wire in FIG. 8, the covered wire Xa to be detected and the covered wire arranged close to each other When Xb was present at the position of the broken line shown in the figure (for example, it was present at the same separation distance as both coated electric wires Xa and Xb shown by the one-point chain wire separated from each other by inserting the voltage sensor 1). In the case of the voltage sensor 1 of this example in which the maximum width Wa at the portion on the tip portion 4a side is sufficiently small, the wire insertion portion 4 can be inserted without significantly deforming both coated wires Xa and Xb. can. However, for example, a "sensor" in which "the maximum width of the tip-side portion in the wire insertion portion" is similar to "the maximum height of the tip-side portion in the wire insertion portion (height Ha in the voltage sensor 1)" (Fig. When (not shown) is used, it is necessary to greatly deform both the coated wires Xa and Xb in order to insert the "tip side portion" between the both coated wires Xa and Xb shown by the solid wire. Therefore, even if the width of the portion on the tip portion 4a side (within the "first range") is not so small as toward the tip portion 4a from the portion having the maximum width Wa as in the voltage sensor 1 of this example. By making the "maximum width" sufficiently smaller than the "maximum height", the "tip side portion" can be easily inserted between the two coated electric wires Xa and Xb arranged in close proximity to each other. I understand.

On the other hand, from the state where both coated electric wires Xa and Xb are guided so that the relative position with respect to the voltage sensor 1 is the position shown by the alternate long and short dash line in FIG. 8 by inserting the portion of the electric wire insertion portion 4 on the tip portion 4a side. To insert the coated wire Xa into the notch 21a, the voltage sensor 1 is further moved in the direction of the arrow D2 with respect to both the coated wires Xa and Xb. In this case, since there is no portion having a large width exceeding the above-mentioned maximum width Wa within the "first range" of the electric wire insertion portion 4, the relative position with respect to the voltage sensor 1 is shown by the alternate long and short dash line in the figure. Both coated electric wires Xa, Xb from the position shown to the position shown by the alternate long and short dash line in FIGS. The voltage sensor 1 (electric wire insertion portion 4) can be smoothly moved.

Next, the voltage sensor 1 (wire insertion) with the center of the electrode holding portion 3 and the wire insertion portion 4 in the cylinder radial direction as the rotation center so that the open end (upper end in FIG. 9) of the notch 21a approaches the covered electric wire Xa. The portion 4) is rotated clockwise when viewed from the grip portion 11a side. At this time, the covered electric wire Xa located at the rim of the tip portion 4a side of the notch 21a as shown by the alternate long and short dash line in FIG. 9 entered the notch 21a as shown by the alternate long and short dash line. Later, it moves by its own restoring force to the position indicated by the broken line so as to approach the coated electric wire Xb indicated by the two-dot chain line.

Subsequently, the force applied to the operation knob 22 (the operation force for moving the wire insertion portion 4 in the direction of the arrow D2 with respect to the electrode holding portion 3) is weakened. At this time, the wire insertion portion 4 is slid in the direction of the arrow D1 shown in FIG. 9 with respect to the electrode holding portion 3 by the urging force (restoring force) of the coil spring (not shown). Further, as the wire insertion portion 4 slides with respect to the electrode holding portion 3, the electrode 2 held by the electrode holding portion 3 is moved relative to the wire insertion portion 4 in the direction of the arrow D2. As a result, the coated electric wire Xa located at the position shown by the broken line in FIGS. 10 and 10 moves in the notch 21a in the direction of the arrow D2 with respect to the electric wire insertion portion 4 together with the electrode 2 after coming into contact with the electrode 2. As shown by the solid line in the figure, it is sandwiched between the electric wire insertion portion 4 and the electrode 2. As a result, the tip portion 2a of the electrode 2 is pressed against the coated electric wire Xa, and the electrode 2 is capacitively coupled to the conducting wire of the coated electric wire Xa. This completes the mounting of the voltage sensor 1 on the covered electric wire Xa.

In the above mounting work example, when the both coated electric wires Xa and Xb reach the rim portion on the tip portion 4a side of the notch 21a by inserting the electric wire insertion portion 4 between the both coated electric wires Xa and Xb. The voltage sensor 1 (wire insertion portion 4) is rotated with respect to both covered electric wires Xa and Xb to insert the coated electric wire Xa into the notch 21a. Instead of such a working method, the tip portion 4a side of the wire insertion portion 4 is reached until the both coated wires Xa and Xb reach the position closer to the rear end portion 4b than the mouth edge portion on the tip portion 4a side in the notch 21a. It is also possible to insert the coated electric wire Xa into the notch 21a by inserting the portion between the both coated electric wires Xa and Xb and then rotating the voltage sensor 1 (electric wire insertion portion 4).

Specifically, the tip portion is located until it is located at the position of the alternate long and short dash line shown in FIG. 8 by inserting the electric wire insertion portion 4 (the state where both covered electric wires Xa and Xb are located within the "second range"). Insert the portion on the 4a side between both covered electric wires Xa and Xb. Next, the voltage sensor 1 (wire insertion) with the center of the electrode holding portion 3 and the wire insertion portion 4 in the cylinder radial direction as the rotation center so that the open end (upper end in FIG. 9) of the notch 21a approaches the covered electric wire Xa. The portion 4) is rotated clockwise when viewed from the grip portion 11a side. At this time, as shown by the alternate long and short dash line in FIG. 8, the covered electric wire Xa located on the side of the notch 21a (within the “second range”) is the opening on the tip portion 4a side of the notch 21a. It can be smoothly entered into the notch 21a without touching the edge.

In this case, in the voltage sensor 1 of this example, as described above, within the "second range (range of arrows Cb shown in FIGS. 5 and 6)", the wire insertion portion 4 (insertion portion main body 21) is "inserted". A portion where the width along the "direction (vertical direction in FIG. 6)" gradually increases toward the rear end portion 4b side is provided in the portion on the tip portion 4a side. Therefore, by inserting the wire insertion portion 4, the relative positions of both covered wires Xa and Xb with respect to the voltage sensor 1 (wire insertion portion 4) are changed from the positions shown by the two-point chain line in FIG. 8 toward the rear end portion 4b. Although it is necessary to further separate the both coated wires Xa and Xb, when the voltage sensor 1 is moved in the direction of the arrow D2 with respect to the both coated wires Xa and Xb (both coated wires Xa and Xb are voltage sensors). (When moving relative to 1 in the direction of the arrow D1), both coated wires Xa and Xb are gradually separated according to the guidance of the wire insertion portion 4 to reach the position indicated by the three-point chain line. Will be. Therefore, both coated electric wires Xa and Xb, which were arranged very close to each other before the insertion of the electric wire insertion portion 4, are both covered until they are located on the side of the above "second range" in the electric wire insertion portion 4. It is possible to smoothly move the electric wire insertion portion 4 with respect to the electric wires Xa and Xb.

After that, the coated electric wire Xa is sandwiched between the electrode 2 and the electric wire insertion portion 4 (the tip portion 2a of the electrode 2 is pressed against the coated electric wire Xa) in the same manner as in the case of the mounting work described above. The electrode 2 is capacitively coupled to the conducting wire of the electric wire Xa, and the mounting of the voltage sensor 1 on the coated electric wire Xa is completed.

On the other hand, when the mounting of the voltage sensor 1 on the coated electric wire Xa is completed as in the example of any mounting work, the measurement process is performed by operating an operation unit (not shown) of the measuring device connected via the signal cable 5. To start. Since the method of measuring the voltage using this type of sensor is known, detailed description thereof will be omitted. As a result, the voltage detection of the coated electric wire Xa as the detection target is completed. Further, when the voltage detection is completed, the voltage sensor 1 is removed from the covered electric wire Xa in the reverse procedure of the above-mentioned work procedure at the time of mounting work. Further, when newly detecting the voltage of the "detection target electric wire" other than the coated electric wire Xa, the mounting operation or the like is executed by the same procedure as the above-mentioned series of operations for the coated electric wire Xa as the detection target. As a result, it is possible to detect the voltage of various "detection target electric wires" other than the coated electric wire Xa in the same manner as the coated electric wire Xa.

In this case, in the voltage sensor 1 of this example, as described above, the minimum width Wb along the "insertion direction" within the "third range (range of arrows Cc shown in FIGS. 5 and 6)" and " A portion on the tip portion 4a side is formed so that both of the minimum heights Hb along the "first direction" are larger than the above-mentioned maximum width Wa in the "first range". Therefore, the width of the "third range" is the same as the portion of the wire insertion portion 4 on the tip portion 4a side (the portion where the notch 21a is formed: within the "first range" and the "second range"). Compared with the narrowly formed configuration, the physical strength of the electric wire insertion portion 4 is sufficiently high, and the shielding effect of the electrode 2 by the electric wire insertion portion 4 is also sufficiently high. Further, the diameter R2 of the electrode 2 is sufficient by inserting the electrode holding portion 3 (electrode 2) into a portion (within the "third range") of the electric wire insertion portion 4 having a sufficiently large width and height. The voltage detection sensitivity is high enough.

Further, in the voltage sensor 1 of this example, the maximum width Wa in the "first range" of the electric wire insertion portion 4 is the "electrode surface (end surface on the tip portion 2a side)" in which the covered electric wire Xa or the like is brought close to the electrode 2. The portion on the tip 4a side is formed so as to be equal to or larger than the width (in this example, the diameter R2 shown in FIG. 6) along the “insertion direction” in the above, and the portion on the tip 4a side in the wire insertion portion 4. The center in the "insertion direction" and the center in the "insertion direction" of the electrode 2 inserted into the wire insertion part 4 while being held by the electrode holding part 3 are the tube lengths of the electrode holding part 3 and the wire insertion part 4. It is configured to match in direction. Therefore, since the shielding effect due to the vicinity of the tip portion 4a in the wire insertion portion 4 is sufficiently high, the noise source is on the left side in FIGS. 8 to 10 (in front of the tip portion 4a in the wire insertion portion 4 of the voltage sensor 1). Even if there is, the situation where noise is detected by the electrode 2 is preferably avoided.

As described above, in this voltage sensor 1, the "first range (in this example, FIGS. 5 and 6) along the" cylinder length direction "from the tip portion 4a to the mouth edge portion on the tip portion 4a side of the notch 21a The maximum width (in this example, the width Wa shown in FIG. 6) along the "insertion direction" of the coated electric wire Xa with respect to the notch 21a in "the range of the arrow Ca in the above) is the" cylinder length direction "and the" insertion direction ". It is smaller than the maximum height along the "first direction" orthogonal to both of the above (in this example, the height Ha shown in FIG. 5), and from the rim portion on the tip portion 4a side of the notch 21a. "Insert direction" in the "second range (in this example, the range in the arrow Cb in FIGS. 5 and 6)" along the "cylinder length direction" to the mouth edge on the rear end 4b side of the notch 21a. A portion is provided along which the width gradually increases, and the "third range (in this example, FIGS. 5 and 6)" on the rear end portion 4b side of the notch 21a on the rear end portion 4b side is provided. The minimum width (in this example, the width Wb shown in FIG. 6) along the "insertion direction" and the "minimum height (in this example) along the" first direction "in" the range of the arrow Cc in ". Then, a portion on the tip portion 4a side of the wire insertion portion 4 is formed so that both of the height Hb) shown in FIG. 5 are larger than the "maximum width (width Wa)" in the "first range". ing.

Therefore, according to the voltage sensor 1, even when the voltage sensor 1 is mounted on the coated electric wire Xa in a state where the gap between the voltage sensor 1 and the adjacent object (for example, the coated electric wire Xb) is extremely small, the close arrangement object 1 is used. By inserting the wire insertion portion 4 into the gap so that the separation direction between the wire and the covered wire Xa is aligned with the width direction at the portion on the tip portion 4a side, the covered wire Xa and the like can be smoothly (smoothly). That is, it can be easily inserted. Further, when the wire insertion portion 4 is inserted between the covered wire Xa and the adjacent object until the covered wire Xa or the like is located on the side of the notch 21a, the “insertion direction” is within the “second range”. Since the portion along which the width gradually increases is provided, the portion on the tip portion 4a side can be inserted so as to gradually separate the coated electric wire Xa from the adjacent object, and as a result, the coated electric wire Xa or the like can be inserted. It can be inserted smoothly (that is, easily) without applying great stress. Further, since the width and height of the electric wire insertion portion 4 in the "third range" are sufficiently large, the physical strength of the electric wire insertion portion 4 is sufficiently high, and noise is mixed into the electrode 2 in the electric wire insertion portion 4. By arranging the electrode 2 having a sufficient thickness together with the electrode holding portion 3 in the wire insertion portion 4 which can be suitably blocked (that is, without causing deterioration of the shielding performance), the “detected amount (that is, the detected amount (that is, the detected amount (without deterioration)) In this example, the detection sensitivity of "voltage)" can be sufficiently increased.

Further, according to the voltage sensor 1, the tip portion of the wire insertion portion 4 is reduced so that the width along the "insertion direction" in the "first range" becomes smaller toward the tip portion 4a from the portion having the maximum width Wa. By forming the portion on the 4a side, even when the gap between the proximity arrangement and the covered electric wire Xa is smaller than the maximum width Wa in the above "first range", the proximity arrangement and the covering are provided. The tip portion 4a can be easily inserted into the gap between the electric wire Xa and the electric wire Xa.

Further, according to this voltage sensor 1, the length along the "cylinder length direction" from the tip portion 4a to the portion of the "maximum width (width Wa)" in the "first range" (in this example, the figure). The tip of the wire insertion portion 4 so that the length L1) shown in 6 is larger than 1/2 (length L2 shown in FIG. 6) of the "maximum width (width Wa)" in the "first range". By forming the portion on the 4a side, the tip portion 4a can be more easily inserted into the gap between the proximity arrangement and the covered electric wire Xa.

Further, according to this voltage sensor 1, the electric wire insertion portion is such that the height along the "first direction" in the "first range" becomes smaller from the portion of the maximum height Ha toward the tip portion 4a. By forming the portion of 4 on the tip portion 4a side, the tip portion 4a can be more easily inserted into the gap between the proximity arrangement and the covered electric wire Xa.

Further, according to this voltage sensor 1, the maximum width (width Wa) in the "first range" is the "insertion direction" on the electrode surface (end surface on the tip portion 2a side) where the coated electric wire Xa or the like is brought close to the electrode 2. By forming the portion on the tip portion 4a side of the wire insertion portion 4 so as to be equal to or larger than the width along the wire insertion portion, noise is mixed from the extending direction of the electrode 2 (direction orthogonal to the electrode surface). It can be suitably blocked by the portion on the tip portion 4a side in 4.

The configuration of the "sensor" is not limited to the example of the configuration of the voltage sensor 1 described above. For example, by sliding the wire insertion portion 4 (operation knob 22) with respect to the electrode holding portion 3 (grip portion 11a), the coated electric wire Xa can be inserted into the notch 21a and the covered electric wire Xa can be detached from the notch 21a. Although the allowable configuration has been described as an example, the cover is covered by sliding the "electrode holding portion" with respect to the "wire insertion portion" or sliding both the "electrode holding portion" and the "wire insertion portion". It is also possible to adopt a configuration that allows the insertion and disconnection of the electric wire Xa. Further, the voltage sensor 1 having a structure in which the cylindrical electrode 2 is held by the cylindrical electrode holding portion 3 and the cylindrical electrode holding portion 3 is inserted into the cylindrical electric wire inserting portion 4 will be described as an example. However, the "electrode" may be formed into a prismatic shape, or the "electrode holding portion" or the "wire insertion portion" may be formed into a square cylinder shape.

In addition, the configuration of the voltage sensor 1 that can be used when detecting the voltage of the coated electric wire Xa as the "detected amount" has been described as an example, but any electrical parameter other than the voltage has been described as the "detected amount". It is also possible to adopt the same configuration as the voltage sensor 1 and the like in the "sensor" that can be detected as (not shown). Further, although the voltage sensor 1 having a configuration for detecting the “detected amount” via the electrode 2 in the state of being capacitively coupled to the conductor of the coated electric wire Xa has been described as an example, the “electrode” in the state of being electromagnetically coupled to the conductor has been described. The configuration of the present invention can also be adopted in a sensor having a configuration in which the "detected amount" is detected via the "detected amount" or a configuration in which the "detected amount" is detected via the "electrode" in a state of being electrically coupled to the conducting wire. ..

1 Voltage sensor 2 Electrode 2a Tip 3 Electrode holder 4 Wire insertion part 4a Tip 4b Rear end 5 Signal cable 11 Holding body 11a Grip a
12 Insulator 21 Insert body 21a Notch 22 Operation knob Ha, Hb Height L1, L2 Length R2 Diameter Wa, Wb Width Xa, Xb Covered wire

Claims (5)

With electrodes
An electrode holding portion formed in a cylindrical shape so that the electrode can be inserted,
Insertion of a wire that is formed into a cylindrical shape with a conductive material that allows the electrode holding portion to be inserted, and that allows the wire to be detected to be inserted into a notch in which a part of the peripheral wall is cut out at the tip end side portion. With a part,
The wire insertion portion is configured to be relatively movable with respect to the electrode holding portion along the cylinder length direction of the electrode holding portion and the wire insertion portion, and the detection target inserted into the wire insertion portion. By bringing the electrode held by the electrode holding portion relatively close to the electric wire, the amount to be detected for the detection target electric wire is measured with respect to the lead wire in the insulation coating of the detection target electric wire through the electrode. It is a sensor configured to be detectable in a non-contact state,
The electric wire insertion portion was formed along the insertion direction of the electric wire to be detected in the notch within the first range along the cylinder length direction from the tip portion to the mouth edge portion on the tip end side of the notch. The maximum width is smaller than the maximum height along the direction orthogonal to both the cylinder length direction and the insertion direction, and the electric wire is inserted in the notch from the mouth edge on the tip end side in the notch. A portion where the width along the insertion direction is gradually increased is provided within the second range along the cylinder length direction up to the mouth edge portion on the rear end portion side of the portion, and the rear end in the notch. The minimum width along the insertion direction within the third range on the rear end side of the mouth edge on the portion side, and the minimum along the direction orthogonal to both the tube length direction and the insertion direction. A sensor in which the tip side portion is formed so that both the height and the height are larger than the maximum width in the first range. Claim 1 in which the tip portion side portion of the electric wire insertion portion is formed so that the width along the insertion direction in the first range becomes smaller from the portion having the maximum width toward the tip portion. The sensor described. The length of the wire insertion portion along the cylinder length direction from the tip portion to the portion having the maximum width in the first range is more than ½ of the maximum width in the first range. The sensor according to claim 2, wherein the tip end side portion is formed so as to be large. In the first range, the height of the electric wire insertion portion along the direction orthogonal to both the cylinder length direction and the insertion direction becomes smaller from the portion having the maximum height toward the tip portion. The sensor according to any one of claims 1 to 3, wherein the tip side portion is formed. The tip end side portion of the electric wire insertion portion is formed so that the maximum width in the first range is equal to or greater than the width along the insertion direction on the electrode surface at which the detection target electric wire is brought close to the electrode. The sensor according to any one of claims 1 to 4.

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